The former SF Giants superstar resurfaced in a photo from Rockies pitcher Adam Ottavino Monday night … and it’s clear Lincecum hasn’t just been chillin’ since getting dropped by the Angels last summer.

The 33-year-old’s putting his new physique to use too … windin’ up the heater in what appears to be a baseball training facility.

No word on an official comeback — but either way, lookin’ good, Timmy! (We do miss the hair, though.)